package day21_28.day27;

import java.math.BigDecimal;
import java.util.Scanner;

public class Main02 {
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        while (scn.hasNext()) {
            BigDecimal a = scn.nextBigDecimal();
            BigDecimal b = scn.nextBigDecimal();
            BigDecimal c = scn.nextBigDecimal();

            if (a.add(b).compareTo(c) == 1 && a.equals(0) && b.equals(0) && c.equals(0)){
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }


        }
    }
}
